Problem

If a value is entered in the search field of 'Preferences > System configuration', that contains a space, this space will automatically be converted to a %20 (URL encoded space) - both in the browser address bar and in the search field itself, but this results into that it will not find something then in the search, despite the matching whitespace-containing value/record would exist in the grid.

Solution

Whitespace should not be URL-encoded when shown in the field, and therefore, search should work as is should.